Sahih al-Bukhari #5035 · Virtues of the Qur'an

Sahih al-BukhariSa'id bin Jubair
Sahih al-Bukhari · Book 66 · Virtues of the Qur'an
Sahih al-Bukhari · كتاب 66 · كتاب فضائل القرآن
Those Suras which you people call the Mufassal, are the Muhkam. And Ibn 'Abbas said, "Allah's Apostle died when I was a boy of ten years, and I had learnt the Muhkam (of the Qur'an)
حَدَّثَنِي مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ أَبِي بِشْرٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، قَالَ إِنَّ الَّذِي تَدْعُونَهُ الْمُفَصَّلَ هُوَ الْمُحْكَمُ، قَالَ وَقَالَ ابْنُ عَبَّاسٍ تُوُفِّيَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَأَنَا ابْنُ عَشْرِ سِنِينَ وَقَدْ قَرَأْتُ الْمُحْكَمَ‏.‏
Reference : Sahih al-Bukhari 5035In-book reference : Book 66, Hadith 58